Canon EF lens mount

Canon EF mount
The electronic contacts (gold-plated) of an EF mount lens.
Typebayonet
Inner diameter54 mm
Flange44 mm

The EF lens mount is the standard lens mount on the Canon EOS family of SLR film and digital cameras. EF stands for "Electro-Focus": automatic focusing on EF lenses is handled by a dedicated electric motor built into the lens. Mechanically, it is a bayonet-style mount, and all communication between camera and lens takes place through electrical contacts; there are no mechanical levers or plungers. The mount was first introduced in 1987.

Canon claims to have produced its 100-millionth EF-series interchangeable lens on April 22, 2014.[1]

  1. ^ Eric Reagan (30 April 2014). "Canon Surpasses 100 Million EF Lenses Produced". Photography Bay.